The following are some suggestions and precautions for the maintenance of DC brushless water pumps:

1. Cleaning: Clean the water pump regularly to remove accumulated dirt and debris. You can use a soft brush or cloth to wipe the outer surface, and ensure that the inlet and outlet are cleaned smoothly. Try to use corrosive or abrasive cleaning fluids.

2. Clean the filter device: If the water pump is equipped with a filter device, clean and replace the filter device regularly to prevent debris from clogging or damaging the water pump.

3. Check the hydraulic seal to ensure that it is intact. Once the hydraulic seal is found to be damaged or weak, replace it regularly to prevent water leakage.

4. Lubrication: Some DC brushless water pumps must be lubricated regularly. Please refer to the product manual or the manufacturer's recommendations to understand the lubrication method and working frequency, and use appropriate lubricants.

5. Check the power supply connection: Check the power cord and connection of the water pump regularly to see if it is reliable. Make sure that the power plug is not worn, broken or has any possible conditions, and fix the connection.

6. Avoid dry running: Avoid running the pump without water to avoid dry running. Dry running may damage the internal parts of the pump, reduce performance and cause common failures.

7. Regular maintenance: Perform regular maintenance according to the manufacturer's recommendations. This will include replacing parts, calibrating sensors, cleaning internal parts, etc. Follow the manufacturer's maintenance schedule to ensure the normal operation and life of the pump.

It is important to note that these are general maintenance recommendations, and the actual daily maintenance requirements may vary depending on the pump model and manufacturer. Therefore, always refer to the product manual or contact the manufacturer for maintenance guidelines and recommendations for your specific pump model.